Layer by Layer Self-assembly Fiber-based Flexible Electrochemical Transistor

Poly(3, 4-ethylenedioxyethiophene)-polystyrene sulfonic acid (PEDOT:PSS)/polyallyl dimethyl ammonium chloride modified reduced graphene oxide (PDDA-rGO) was layer by layer self-assembled on the cotton fiber. The surface morphology and electric property was investigated. The results confirmed the dense membrane of PEDOT: PSS and the lamellar structure of PDDA-rGO on the fibers. It has excellent electrical conductivity and mechanical properties. The fiber based electrochemical transistor (FECTs) prepared by the composite conductive fiber has a maximum output current of 8.7 mA, a transconductance peak of 10 mS, an on time of 1.37 s, an off time of 1.6 s and excellent switching stability. Most importantly, the devices by layer by layer self-assembly technology opens a path for the true integration of organic electronics with traditional textile technologies and materials, laying the foundation for their later widespread application.